Prepay Data SIM for London/UK for 14 days?

*I'm not sure if this is best suited for the Mobile forum or the Lounge*

I am looking for a recommendation for a London/Britain prepay data only plan. I am looking for something with 3G or better if possible and lasting about 14 days or the usual 30 days. I am going to be in London for a week and the English countryside for a week after that and would like to use a prepay SIM for data to keep on top of things while away. Any recommendations would be appreciated.

I can't seem to find any old threads for this particular location with search though my search string may be faulty.

My advice - avoid LeBara. They might be cheap, but they're also utterly appalling for anything but voice. When I went over and bought a 3G data and voice sim from them I barely got a signal in London and Somerset, and on the motorway in between. When I did data speeds were so pathetic as to be barely worthwhile. Took a good minute to load a few map tiles on my Galaxy Nexus while in Trafalgar Square.

I switched to a Sim from Tesco (a major supermarket chain) and got the experience I was after. £15 got me 500MB of data, 5000 texts and 250 minutes of calls within the UK. An extra 3 quid upped the data allowance to 1Gb. You can top up any time, although I went over my data limit by about 100mb, and it was still working quite happily, despite not having handed over credit card or bank details of any kind. Maybe an oversight on their part.

I used 02 and loved it, they even have an add on for all you can call to 3 numbers(which even provides a US number for people to call you, which can then be setup as a number for google voice so that you basically get free unlimited calling to the US and Canada).

That add on is 9 pounds, and if you top up 10 pounds you get free data, texts anyways. 3 is also decent prices for data.

And it looks like while the internatinal pick 3 plan exists for O2 still, they killed off the data plans I used. I'd say go with 3, as they offer all you can use data for 15 pounds on the prepay, BYOD plans.

Yeah you'll be able to pick up a variety pre-paid from all of the networks and 3 for example offer pre-paid sim only packs that come with 1 or 3GB on them if you're just looking for data (check on ebay for examples). Stay with one of the networks (O2/Vodafone/EE(formerly T-Mobile, Orange)/Giff gaff or with the supermarket branded ones. In terms of speed you're not going to get anything better than HSDPA (no 4G to speak of here yet). 3.5G should be fine throughout London whoever you're on but you may find data coverage iffy in the country. You'll have signal but the data rate may vary depending exactly where you are.